love or illusion?

After all these years,all these hardship and difficulties that Gatsby had gone through,when he finally grasped the chance to embrace his dream girl once more,he kept showing "the expression of bewilderment"!So I cannot stop myself wondering who or what is the wealthy but poor man really loved?The girl or just an illusion?After all,even Daisy cannot statisfy his colossal vitality of dream,when the distance between them is as close as a star to the moon.